Mercedes-Benz CL-Class 2011 - Manual (Page 69)

period of time. If you approach an obstacle
and PRE-SAFE
® Brake detects a risk of a
collision, the system will initially alert you
both visually and acoustically. If you yourself
do not brake or steer, the vehicle will
automatically brake slightly. In the event of
an increased risk of a collision, PRE-SAFE
® is
activated ( Y page 51).
G Warning!
The PRE-SAFE ® Brake will only respond with
brake assistance if it has clearly detected an
object. Detection can be impeded by:
R dirty or covered sensors
R snowfall or heavy rain
R disturbance from other radar sources
R strong radar reflection such as in parking
garages
The PRE-SAFE ® Brake uses radar signals that
are not reflected well by narrow objects and
absorptive materials. For this reason the PRE-
SAFE
® Brake will not react to persons,
animals, and approaching traffic or cross-
traffic.
The PRE-SAFE
® Brake may not detect narrow
vehicles driving in front of you, such as
motorcycles and vehicles driving offset from
your vehicle center.
In order to maintain the appropriate distance
to the vehicle in front and thus prevent a
collision, you must apply the brakes yourself.
At speeds up to approximately 40 mph
(70 km/h), PRE-SAFE
® Brake can also detect
stationary obstacles, for example stopped or
parked vehicles.
G
Warning!
If you do not receive visual or acoustic
warning signals, the PRE-SAFE
® Brake may
R not have recognized the collision risk
R have been deactivated
R be malfunctioning
Apply the brakes yourself to avoid a collision.
X To activate/deactivate: activate or
deactivate PRE-SAFE
® Brake in the on-
board computer ( Y page 340).
After activation, the Ä symbol is
displayed on the left in the instrument
cluster.
For PRE-SAFE ® Brake to assist you when
driving, the radar sensor system must be
switched on and operational.
PRE-SAFE
® Brake does not always detect
complex traffic situations properly. You can
terminate the braking action of PRE-SAFE
®
Brake in a non-critical driving situation at any
time if:
R an acoustic and visual warning occurs
R the vehicle brakes gently
To end this, you can either depress the
accelerator pedal further, activate kickdown
or release the brake pedal.
The braking action of PRE-SAFE
® Brake is
ended automatically if:
R you maneuver to avoid the obstacle
R you drive slower than approximately 9 mph
(15 km/h)
R
there is no longer an obstacle detected in
front of your vehicle
R there is no longer any danger of a collision
i While DISTRONIC PLUS is activated, PRE-
SAFE ® Brake remains passive.
Following a collision or collision-related
damage to the front end of the vehicle, have
the configuration and operation of the radar
sensors checked. Choose a qualified
specialist workshop for this that has the
necessary specialist knowledge and tools for
the work required. Mercedes-Benz
recommends that you use an authorized
Mercedes-Benz Center for this purpose.
Driving safety systems
67
Safety
Z